JP2007305082A - Content distribution server and content distributing method or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content distribution server, a content distributing method or the like effectively selling and buying content data in a form that is conventionally difficult. <P>SOLUTION: Distributed content data is stored in a storing means of a content presenting device, a quality deterioration program attached to the content data stored in the storing means is started by the content presenting device, and the content presenting device functions as a deterioration presenting means for presenting the content data to a user by deteriorating the quality of at least a portion of the content data. When the content presenting device acquires quality deterioration stop/reduction data for stopping or reducing the quality deterioration of the content data, the quality deterioration program makes the content providing device function as a deterioration providing means for reducing the quality deterioration of the content data and presenting the content data to a user on the basis of the quality deterioration stop/reduction data, while stopping the activation of the quality deterioration program. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technical field such as a content distribution server device and a content distribution method for distributing content data to a content presentation device that presents content data to a user.

  Conventionally, with the development of information communication means, creation of information by information such as characters, music, images, etc., for example, distribution of digital contents from a Web server on a network such as the Internet to a terminal device such as a personal computer or a mobile phone, etc. As a result, the user can view and listen to the digital content on the terminal device.

  In recent years, from the viewpoint of copyright protection and the like, for example, as disclosed in Patent Documents 1 and 2, digital content is encrypted and distributed to a terminal device, and on the terminal device side, a content distributor or the like In general, a method of releasing the encryption or the like and presenting it to the user (for example, screen display, audio reproduction, etc.) so that the user can view and the like only when a contract for content viewing and the like is made. It is used.

  On the other hand, creations such as those described above are printed or recorded on articles such as books, records, CDs (Compact Disks), videotapes, DVDs (Digital Versatile Discs), and the ownership of these articles is transferred. It is also distributed.

  These goods are first handed over from the producers to the consumers as primary distribution goods, and some of them are handed over to other consumers as secondary distribution goods after passing through a specific distributor. It is supposed to cross over. Secondary distribution goods are sometimes called second-hand goods, and their needs are increasing due to the recent recession and the spread of online auctions because they are generally lower in price than primary distribution goods. . In particular, if you want to obtain multiple creations, such as a novel of a series or a CD album that contains multiple songs, the price difference from the primary distribution product will increase, so the secondary distribution product The need for is expected to become stronger.

  In the direct transaction of digital contents on the network, a technique with a view to secondary distribution of digital contents such as resale and resale has begun to be searched.

  For example, in Cited Document 3, in a resale terminal for reselling content within the sales conditions permitted by the content seller, there is a permission for encapsulation from the copyright protection management terminal, and a resale permission from the content sales terminal. In such a case, an invention relating to a content distribution method of transferring a content to a terminal using the content after re-encapsulating the specified content with new sales conditions and the like is disclosed.

  Also, cited document 4 discloses an invention relating to a rights resale system in which an access right to content is resold and the content is provided only to a computer having the access right.

Also, in the cited document 5, when the server receives the content information and purchase attribute information transmitted from the terminal A of the user who desires to purchase, the server searches for the terminal B permitted for resale, and purchase attribute An invention relating to a content resale method for transmitting content from terminal B to terminal A by transmitting information to terminal B is disclosed.
Japanese Patent Laid-Open No. 7-231440 JP 2003-143572 A JP 2003-256597 A JP 2001-325461 A JP 2006-039832 A

  However, in the conventional technology described above, there are only two presentation modes of presenting or not presenting digital content to the user. Therefore, the digital content is not viewed or paid to the user. Will be forced to choose between the two. Therefore, the user is forced to judge the purchase of the digital content by viewing only a part of the content data such as the advertisement and the digest version, and at the same time, without having the opportunity to examine the content sufficiently. I had to buy it.

  In addition, since there is no concept of new or second-hand goods for digital content, it is difficult to act as an incentive to create a difference in sales price between primary distribution content and secondary distribution content. Therefore, digital content producers and sellers tend to think that it is only necessary to prevent secondary distribution and gain profits from primary distribution, and digital content resale on the network is effectively performed. It never happened.

  The present invention has been made in view of the above points, and it is an object of the present invention to provide a content distribution server device, a content distribution method, and the like that can effectively sell and sell content data in a form that has been difficult in the past. And

  In order to solve the above problem, the invention described in claim 1 is a content distribution server device that distributes the content data to a content presentation device that presents content data to a user, and the content data includes the content data A quality degradation program for degrading the quality of at least a part of the data is added, and content storage means for storing the content data and the stored content data are transmitted to the content presentation device via the communication means. Content distribution means for distributing, wherein the distributed content data is stored in a storage means of the content presentation device, and a quality deterioration program added to the content data stored in the storage means is the content presentation The content data is activated by the device Quality degradation stop reduction data for causing the content presentation device to function as degradation presentation means for degrading at least part of the quality and presenting it to the user, and for stopping or reducing degradation of the quality of the content data When acquired by the content presentation device, the quality degradation program is stopped from the start, or based on the quality degradation stop reduction data, the content data is reduced by reducing the quality degradation. The content presenting apparatus is caused to function as the deterioration presenting means presented to a user.

  According to the present invention, the distributed content data has its quality deteriorated and is presented to the user. However, when the quality deterioration reduction stop data is acquired, the quality deterioration is stopped or reduced. Since it is presented to the user, the user can view all of the content data whose quality has been degraded, and if he / she likes the content data, he / she pays for the acquisition of the quality degradation reduction stop data. By doing so, it is possible to view content data with better quality.

  According to a second aspect of the present invention, in the content distribution server device according to the first aspect, among the content data stored in the content storage unit, the content data sold together with the other content data is: Content data that has a lower degree of quality degradation than content data sold alone, and the content distribution means distributes a plurality of the content data sold in a batch to the content presentation device. It is characterized by.

  According to the present invention, it is possible to improve a user's willingness to purchase a plurality of content data in a batch.

  According to a third aspect of the present invention, in the content delivery server device according to the first or second aspect, the content data includes sound data, and a noise component is added to the sound data. The quality deterioration program causes the content data to function as the deterioration presentation means for reproducing the sound data together with the added noise component.

  According to the present invention, it becomes easy to deteriorate the sound quality of content data, or to stop or reduce the deterioration.

  According to a fourth aspect of the present invention, in the content presentation device according to the third aspect, a phase inversion component of the noise component is further added to the sound data, and the quality degradation stop reduction data is the content presentation. When acquired by the apparatus, the quality deterioration program reproduces the sound data by removing the noise component by the added phase inversion component based on the quality deterioration stop reduction data. The content data is made to function as a means.

  According to the present invention, it is easy to reduce deterioration of the sound quality of content data.

  The invention according to claim 5 is a server device that distributes the quality degradation stop reduction data according to claim 1, and distributes the quality degradation stop reduction data to the content presentation device via the communication means. It is characterized by comprising quality degradation stop reduction data distribution means.

  The invention described in claim 6 is the content presentation device according to claim 1, wherein the content presentation device according to claim 1 is configured to acquire the distributed content data, and the acquisition Content storage means for storing the obtained content data in the storage means, deterioration stop reduction data acquisition means for acquiring the deterioration stop reduction data from the server device via the communication means, and the deterioration presentation means. It is characterized by that.

  The invention according to claim 7 is a content delivery method for delivering content data to a content presentation device that presents content data to a user, wherein the content data has at least a partial quality degradation. And a content storage step for storing the content data, and a content distribution step for distributing the stored content data to the content presentation device via a communication unit. The distributed content data is stored in the storage unit of the content presentation device, and the quality degradation program added to the content data stored in the storage unit is activated by the content presentation device, and the content data is stored in the storage unit. , Deteriorate the quality of at least part of it The content presentation device is made to function as a degradation presentation means to be presented to the user, and quality degradation stop reduction data for stopping or reducing degradation of the quality of the content data is acquired by the content presentation device. In this case, the quality degradation program is the degradation presentation means for stopping the activation or presenting the content data to the user by reducing the quality degradation based on the quality degradation stop reduction data. The content presentation apparatus is made to function as:

  According to an eighth aspect of the present invention, there is provided a content distribution server device for distributing content data to a content presentation device for presenting content data to a user, the quality degradation for degrading the quality of at least a part of the content data. A computer included in a content distribution server device that distributes content data to which a program is added, content storage means for storing the content data, and distribution of the stored content data to the content presentation device via communication means And the distributed content data is stored in the storage unit of the content presentation device, and the quality deterioration program added to the content data stored in the storage unit is stored in the content presentation device. Launched by The content presentation device is made to function as a degradation presentation means for presenting the content data to the user with at least a part of the quality degraded, and for stopping or reducing the degradation of the quality of the content data When the quality degradation stop reduction data is acquired by the content presentation device, the quality degradation program is stopped from starting, or the content data is converted to the quality degradation stop data based on the quality degradation stop reduction data. The content presentation apparatus is made to function as the degradation presentation unit that reduces degradation and presents to the user.

  According to the present invention, the distributed content data has its quality deteriorated and is presented to the user. However, when the quality deterioration reduction stop data is acquired, the deterioration of the quality is stopped or reduced. Since it is presented to the user, the user can view all of the content data whose quality has been degraded, and if he / she likes the content data, he / she pays for the acquisition of the quality degradation reduction stop data. By doing so, it is possible to view content data with better quality. As a result, for example, content data with degraded quality is distributed as a trial version, etc., and then purchased by regular purchase, etc., so that it is possible to view content data with better quality, or content data with degraded quality is used. Content data can be effectively bought and sold in a form that has been difficult in the past, such as reselling in the same manner as products.

  Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. In addition, embodiment described below is embodiment at the time of applying this invention with respect to a music delivery system.

[1. Outline of composition and function of music distribution system]
First, the configuration and functional overview of the music distribution system S according to the present embodiment will be described with reference to FIG.

  FIG. 1 is a diagram illustrating an example of a schematic configuration of a music distribution system S according to the present embodiment.

  As shown in FIG. 1, the music distribution system S includes a plurality of mobile phones Pk (k = 1, 2,... N) as an example of a content presentation device, and a content server CS including a music DB (database) 101. , A noise server NS including the application DB 111, a used content server US as an example of a server device and a content distribution server device including a used music DB, and the like.

  Here, for example, the content server CS and the noise server NS are servers constituting a music distribution site established by a distributor that produces and distributes music data (an example of content data), and the used content server US This server constitutes a music resale site established by a reseller who resells data. Of course, these servers may be installed by the same company or the like.

  The mobile phone Pk, the content server CS, the noise server NS, and the used content server US can exchange data with each other via the network NW (for example, TCP / IP (Transmission Control Protocol / Internet Protocol) as a communication protocol) Data can be transmitted and received between each other). The network NW is constructed by, for example, the Internet, a dedicated communication line (for example, a CATV (Community Antenna Television) line), a mobile communication network (including a wireless base station, etc.), a gateway, and the like.

  In the music distribution system S having the above-described configuration, the mobile phone Pk reproduces music data and amplifies music corresponding to the music data. This music data is stored in the music DB 101, and is distributed by downloading from the content server CS to the mobile phone Pk of the user who wishes to purchase (the music data is distributed to the mobile phone Pk by the content server CS). It is designed to be sold for the first time to the user from a vendor. In addition, a playback application program (hereinafter simply referred to as a playback application) executed by the mobile phone Pk to play music data is stored in the application DB 111 and downloaded from the noise server NS to the mobile phone Pk. It has become.

  Among the music data sold for the first time, the music data judged to be unnecessary by the user of the mobile phone Pk is uploaded (transmitted) to the used content server US together with the corresponding reproduction application, and stored in the used music DB 121. The user sells the product to a reseller (in this embodiment, it is exchanged for a service point, not for money). At this time, the sold music data is still stored in the mobile phone Pk. However, when the music data is reproduced, noise is superimposed, that is, the sound quality is deteriorated (at least enough to withstand viewing). The music has been expanded. As an alternative, a service point that can be used to purchase music data is given to the user of the mobile phone Pk.

  And the music data memorize | stored in used music DB121 are resold to a user from a reseller by downloading to the mobile telephone Pk of the user who wishes to purchase from the used content server US. . When the resold music data is reproduced, the music on which the noise is superimposed is amplified as in the case of the sold music data. In this way, since the sound quality of the music data to be resold is degraded from the sound quality of the music data to be sold for the first time, in this embodiment, the sales price at the resale of the music data is set to be higher than the sales price at the time of the initial sales. It was decided to set it low.

  Furthermore, a release key (an example of quality degradation stop reduction data) for removing noise from the music is provided on the mobile phone Pk of the user who wishes to listen to the music in a state where noise is not included in the resold music data. It is downloaded from the used content server US. This release key is generated by the noise server NS and transmitted to the used content server US.

  In this way, when the music data for which the release key is acquired is reproduced in the mobile phone Pk, the music from which noise is removed is amplified. However, in this case, the sound is loudened in a state where the sound quality is slightly deteriorated compared to when it was first sold (to the extent that it is difficult to determine that the sound quality is deteriorated).

  In the following description, song data sold to resellers and resold song data, that is, song data with degraded sound quality, are distinguished from song data sold for the first time and are also referred to as used song data. .

[2. Composition of song data]
Next, the composition of music data will be described with reference to FIGS.

  FIG. 2 is a diagram showing an example of the composition of music data according to the present embodiment. FIG. 3 is a diagram showing an example of the configuration of music audio data, where (a) is regular music data, (b) is noise data, and (c) is anti-phase noise data.

  As shown in FIG. 2, the music data includes music audio data and property data.

  The music audio data is data for amplifying music on the mobile phone Pk. As shown in FIG. 3, the music audio data includes regular music data as an example of sound data (FIG. 3A), noise data as an example of a noise component (FIG. 3B), and a phase inversion component. And anti-phase noise data as an example (FIG. 3A).

  The regular music data is audio data for amplifying music that does not contain noise. When music data sold for the first time is reproduced, only regular music data is reproduced.

  Noise data is audio data created by mixing pink noise of a certain length of time (t1) every predetermined time interval (t2), and reproduces music data sold to resellers and resold music data In this case, it is reproduced together with regular music data. Note that the noise length (t1) and the noise interval (t2) may be a random time instead of a fixed time, or no noise interval may be provided (the noise is uniformly applied to the music). It will be in a state of overlapping).

  The reverse-phase noise data is audio data created by inverting the noise phase in the noise data. When the music data for which the corresponding release key is acquired from the resold music data is reproduced, the regular music data And reproduced with noise data. As a result, the noise component included in the noise data and the negative phase component included in the negative phase noise data cancel each other, and the noise component is removed. However, the sound quality of the music that is loudened from the regular music data in accordance with the removal of the noise component is slightly deteriorated compared to the sound quality of the music that should be loudened.

  For example, if the mobile phone Pk is configured to be capable of multi-channel playback such as 5.1 channel, regular music data is assigned to channels 1 and 2, noise data is assigned to channels 3 and 4, and vice versa. Phase noise data may be assigned to channels 5 and 6. In this case, in the mobile phone Pk, only the regular music data of the channels 1 and 2 is reproduced for the music data sold for the first time, and the noise of the channels 3 and 4 is further processed for the music data resold. Data may also be reproduced, and the music data for which the release key has been acquired may be configured to further reproduce the anti-phase noise data of channels 5 and 6.

  On the other hand, if the mobile phone Pk is configured so that multi-channel playback is not possible, for example, the audio data may be mixed down (tracked down) in advance. In this case, normal music data and noise data are combined to create noise-containing music data, and normal music data, noise data, and reverse-phase noise data are combined to generate noise-removed music data. Then, music audio data is created in a state including regular music data, noise-containing music data, and noise-removed music data. In the mobile phone Pk, only the regular music data is reproduced for the music data sold for the first time, and only the music data with noise is reproduced for the resold music data, and the release key is acquired. For music data, it may be configured to reproduce only noise-removed music data.

  The composition of the music data is arbitrary. However, for example, music data having two types of composition is stored in the music DB 101 in advance, and the music data is distributed when the music data is distributed by the content server CS. It may be determined whether or not multi-channel playback is possible with reference to the terminal type of the telephone Pk, and distributed according to the determination result.

  The data format of each audio data is arbitrary, and for example, a data format such as MLD (music for imode), MIDI (Musical Instrument Digital Interface), MP3 (MPEG Audio Layer-3), etc. can be used.

  Returning to FIG. 2, the property data includes music detailed information, copy information, and download information.

  In the detailed music information, for example, information related to music such as music ID (identification information), music title, artist name, track number, genre, lyrics, application ID indicating a reproduction application for reproducing the music data, and the like. include.

  The copy information is information indicating whether or not the music data has been copied after the music data has been sold for the first time. If it has not been copied, no copy is set, and if it has been copied, copied has been set. It is like that. When the music data is distributed from the content server CS to the mobile phone Pk, this copy information is set to no copy, and the mobile phone Pk performs, for example, for music data such as uploading the music data to the used content server US. When an operation involving copying occurs, it is set to already copied.

  The download information includes, for example, download flag information indicating whether or not the music data has been downloaded from the content server CS together with other music data (that is, the initial sales in a batch), and the music Corresponding music information (for example, music ID, music title, music data file name, etc.) indicating the music data downloaded together with the data is included. While no download (single download) is set in the download flag information of music data distributed independently from the content server CS, there is a set of download in the download flag information of all music data distributed in a batch. In addition, information indicating the remaining music data is set in the corresponding music information of each music data. For example, when music data A, B, and C are delivered in a lump, the titles of music data B and C are set in the corresponding music information of music data A, and the music data A is stored in the corresponding music information of music data B. The titles of music data A and B are set in the corresponding music information of the music data C.

  The music data for which “downloaded collectively” is set in the download flag information can be downloaded and uploaded only together with the music data indicated in the corresponding music information.

[3. Configuration and functions of content server, noise server, and used content server]
Next, configurations and functions of the content server CS, the noise server NS, and the used content server US will be described with reference to FIGS.

  FIG. 4 is a block diagram illustrating a schematic example of a basic configuration common to the content server CS, the noise server NS, and the used content server US according to the present embodiment.

  As shown in FIG. 4, the content server CS, the noise server NS, and the used content server US are connected to the network NW to control communication with the mobile phone Pk and other server devices, and various programs and data. Etc., and a system control including a storage unit 12 (for example, a hard disk drive) in which various databases are constructed, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like The system control unit 13 and each unit are connected to each other via a system bus 14.

  In the system control unit 13, the CPU controls the entire server by reading and executing various programs (for example, an operating system, a music distribution processing program, etc.) stored in the ROM or the storage unit 12. Note that the various programs may be downloaded from another server, for example, or may be recorded on a recording medium such as a CD-ROM and read via a drive.

  First, the content server CS distributes music data that is initially sold to the mobile phone Pk as a music distribution site. In the storage unit 12 of the content server CS, a music DB 101 in which music data is stored is constructed.

  FIG. 5 is a diagram illustrating an example of music data stored in the music DB 101.

  As shown in FIG. 5, in the music DB 101, a plurality of music data (9 songs of music A to music I in the example of FIG. 5) are grouped into one group (hereinafter referred to as an album) and are in units of albums. It has come to be remembered. Each piece of music data included in one album is stored in a plurality of types corresponding to the number of batch downloads when downloaded. For example, in the example of FIG. 5A, the number of batch downloads is one song, that is, music data that is downloaded independently, the song data that is a batch download number is two songs, the number of batch downloads is all songs (9 songs), that is, an album Music data that is collectively downloaded as a whole is stored corresponding to each music.

  Here, no copy is set in the copy information of each piece of music data. Also, the download flag information for music data that is downloaded independently is set to no batch download, and the download flag information for music data that is batch downloaded for two songs and music data that is downloaded for the entire album is batch downloaded. Is set. Furthermore, the titles of the other eight songs are set in the corresponding song information of the song data that is collectively downloaded for the entire album.

  As music data to be downloaded alone, music data including noise data having a noise length (t1) of 3 seconds shown in FIG. 3B is stored, and music data that is downloaded in a batch of 2 music is stored. Music data including noise data having a noise length of 2 seconds is stored, and music data including noise data having a noise length of 1 second is stored as music data to be downloaded at the same time for the entire album. Thus, in this embodiment, as the number of pieces of music data to be downloaded in a batch increases, the ratio of mixing noise into the music decreases, and the sound quality becomes higher for users who purchase a plurality of music data at once. We decided to distribute good music data.

  In addition to changing the noise length as described above, for example, as shown in FIG. 5B, the noise interval (t2) may be changed according to the number of batch downloads, or the noise volume may be changed. Anyway.

  A user DB is also built in the storage unit 12 of the content server CS (not shown). In the user DB, information related to the user of the mobile phone Pk registered in the music distribution site (for example, the user's name, age, gender, address, telephone number, e-mail address, mobile phone Pk type, credit card number, The purchase history of music) is stored in association with the user ID, for example.

  In response to a request from the mobile phone Pk, the system control unit 13 of the content server CS performs Web content data (for example, HTML (eXtensible HyperText Markup Language) data, image data) corresponding to a music search page, a music list page, or the like. The web content data is distributed to the mobile phone Pk.

  Further, the system control unit 13 of the content server CS distributes the music data stored in the music DB 101 to the mobile phone Pk alone or in a batch according to the music purchase request transmitted by the mobile phone Pk. It is supposed to be. At this time, when the music data for two songs are delivered in a lump, the title of the other music data is set in the corresponding music information of each music data read from the music DB 101, and then the music data is delivered. It is supposed to be.

  Next, the noise server NS distributes the reproduction application to the mobile phone Pk, and transmits a release key to the used content server US. In the storage unit 12 of the noise server NS, an application DB 111 in which a reproduction application is stored is constructed.

  FIG. 6 is a diagram illustrating an example of a reproduction application stored in the application DB 111.

  As shown in FIG. 6, in the application DB 111, for example, a reproduction application corresponding to each piece of music data is stored in association with an application ID uniquely assigned to each reproduction application. Each reproduction application includes a reproduction program portion for accessing the music audio data of the corresponding music data and reproducing the music data. When reproducing the music data, if the music data is copied after the first sale (the copy information has already been copied), the degraded reproduction program portion for reproducing the regular music data together with the noise data or the like (An example of a quality deterioration program) is included. Further, each reproduction application includes a transmission program portion for uploading corresponding music data to the used content server US. Each piece of music data can be played back only by a corresponding playback application, for example.

  The system control unit 13 of the noise server NS is configured to distribute the playback application stored in the application DB 111 to the mobile phone Pk in response to the playback application request transmitted by the mobile phone Pk.

  Further, the system control unit 13 of the noise server NS generates a release key corresponding to the music data for removing noise in response to the release key request transmitted by the used content server US, and uses the release key as the used content server US. To be sent to. The release key may be, for example, information that is referred to when a playback application is executed on the mobile phone Pk, or may be an additional program for noise removal that is called from the playback application. Also, the release key does not necessarily have to be generated every time a release key request is received. For example, a release key corresponding to music data is registered in advance in a database or the like in association with a music ID or the like. In response to the release key request, it may be read from a database or the like.

  Next, the used content server US receives, as a music resale site, the used music data from the mobile phone Pk together with the corresponding playback application, while the used music data and the playback application of the user who wishes to purchase the mobile phone Pk. To be delivered to. In the storage unit 12 of the used content server US, a used music DB 121 in which used music data and a reproduction application are stored is constructed.

  FIG. 7 is a diagram illustrating an example of used music data and a reproduction application stored in the used music DB 121.

  As shown in FIG. 7, for example, used music data uploaded by the mobile phone Pk and a playback application corresponding to the used music data are given to the used music DB 121 in accordance with the order of uploading or the like. Stored in association with the ID. Further, a single ID is collectively given to used music data (used music data with a download flag being batch downloaded) and playback application that are collectively uploaded from the mobile phone Pk.

  In the storage unit 12 of the used content server US, a user DB (not shown) in which information related to the user of the mobile phone Pk registered in the music resale site is stored.

  In response to a request from the mobile phone Pk, the system control unit 13 of the used content server US generates Web content data corresponding to a used music search page, a music list page, and the like, and uses the Web content data as a mobile phone. Delivered to Pk.

  Further, the system control unit 13 of the used content server US receives the used music data and the reproduction application transmitted by the mobile phone Pk, and stores the used music data and the reproduction application in the used music DB 121 as content storage means. It has become.

  Further, the system control unit 13 of the used content server US uses the used music data stored in the used music DB 121 and the corresponding reproduction application in response to the used music purchase request transmitted by the mobile phone Pk as the content distribution means. , Read in units of assigned IDs (single uploads are single and batch uploads are batches), and a playback application is added to the read used music data and distributed to the mobile phone Pk. ing.

  Furthermore, the system control unit 13 of the used content server US acquires the release key from the noise server NS in response to the release key purchase request transmitted by the mobile phone Pk as the quality degradation stop reduction data distribution means, and cancels the release. The key is distributed to the mobile phone Pk.

[4. Configuration and function of mobile phone]
Next, the configuration and function of the mobile phone Pk will be described with reference to FIGS.

  FIG. 8 is a block diagram showing an example of a schematic configuration of the mobile phone Pk according to the present embodiment.

  As shown in FIG. 8, a mobile phone Pk is connected to a network NW by radio wave transmission / reception with a radio base station, and controls a radio communication unit 21 that controls communication with other mobile phones Pk, servers, etc., for example, a microphone A voice input unit 22 having an A / D converter, etc., and generating voice data corresponding to the voice when the user's uttered voice is input from the microphone and outputting the voice data to the wireless communication unit 21; An audio output unit 23 that has a circuit and the like, generates audio corresponding to the audio data supplied from the wireless communication unit 21, audio corresponding to the music data stored in the storage unit 26, and the like, and loudspeaks with a speaker; , And can communicate with other mobile phones or perform data communication with a server or the like. As such a communication method, for example, a PDC (Personal Digital Cellular) method, an IMT (International Mobile Telecommunication) method, a PHS (Personal Handyphone System) method, or the like is adopted.

  In addition, the mobile phone Pk receives an input of an operation instruction from a display unit 24 (for example, a liquid crystal display, an organic EL display, etc.) that displays information such as characters and images on the screen, and displays the instruction content as an instruction signal. And an operation unit 25 (for example, a numeric keypad and operation buttons) that output to the system control unit 27.

  Furthermore, the cellular phone Pk includes a storage unit 26 (for example, a flash memory) as an example of a storage unit that stores various programs, data, and the like.

  FIG. 9 is a diagram showing an example of storage area allocation in the storage unit 26 of the mobile phone Pk.

  The storage unit 26 stores downloaded music data, a playback application, and a release key. As shown in FIG. 8, in the storage unit 26, program storage areas 1, 2,... N for storing playback applications, music storage areas 1, 2,. There are provided release key storage areas 1, 2... N for storing keys. Here, reproduction applications corresponding to the music data stored in the music storage areas 1, 2,... N are stored in the program storage areas 1, 2,. .., N stores release keys corresponding to the music data stored in the music storage areas 1, 2,.

  From the viewpoint of preventing unauthorized copying and the like, each music storage area is preferably accessible only from programs stored in the corresponding program storage area.

  The cellular phone Pk further includes a system control unit 27 as an example of an acquisition unit including a CPU, RAM, ROM, and the like, a copy determination unit, a quality degradation reduction data acquisition unit, and a degradation presentation unit. Are connected to each other via a system bus 28.

  The system control unit 27 controls the entire mobile phone Pk by reading and executing various programs stored in the ROM or the storage unit 26, and as an acquisition unit, a quality degradation stop reduction data acquisition unit, and a degradation presentation unit. It is supposed to function.

  Specifically, the system control unit 27 transmits a purchase request for music data corresponding to the music selected by the user via the operation unit 25 to the content server CS and receives the music data distributed from the content server CS. And stored in the storage unit 26.

  Further, when the system control unit 27 receives the music data from the content server CS, the system control unit 27 transmits a request for the reproduction application corresponding to the music data to the noise server NS, and the reproduction application distributed from the noise server NS. It is received and stored in the storage unit 26.

  Further, the system control unit 27 executes the playback application for the music data and the playback application corresponding to the music selected by the user via the operation unit 25 among the music data and the playback application stored in the storage unit 26. By doing so, it uploads to the used content server US. At this time, the system control unit 27 uploads the music data for which “downloaded collectively” is set in the download flag information together with the music data indicated in the corresponding music information. Further, the system control unit 27 sets the copy information of the music data as copied before uploading the music data as an updating means.

  Furthermore, the system control unit 27 transmits, as an acquisition unit, a used music data purchase request corresponding to the music selected by the user via the operation unit 25 to the used content server US and is distributed from the used content server US. The used music data and the reproduction application added to the used music data are received and stored in the storage unit 26 as content storage means.

  Furthermore, the system control unit 27 converts the used music data corresponding to the music selected by the user via the operation unit 25 out of the used music data stored in the storage unit 26 as quality degradation stop reduction data acquisition means. The corresponding release key purchase request is transmitted to the used content server US, and the release key distributed from the used content server US is received and stored in the storage unit 26.

  Furthermore, the system control unit 27 reproduces the music data stored in the storage unit 26 corresponding to the reproduction application by executing the reproduction application stored in the storage unit 26 as a deterioration presenting unit. The audio output unit 23 is controlled to amplify the music corresponding to the music data. At this time, if the music data has not been copied (the copy information is not copied), the system control unit 27 does not activate the deteriorated reproduction program portion, and does not activate the music data so that only regular music is amplified. It comes to play. When the music data is copied (copy information has been copied) and the release key corresponding to the music data is not stored in the storage unit 26, the system control unit 27 displays the deteriorated playback program portion. And the music data is reproduced so that the music on which the noise is superimposed is amplified. When the music data is copied and the release key corresponding to the music data is stored in the storage unit 26, the system control unit 27 activates the deteriorated reproduction program part and The music data is reproduced so that the music from which noise has been removed is amplified by noise.

[5. Operation of Music Distribution System S]
Next, the operation of the music distribution system S will be described with reference to FIGS.

  First, the operation when music data is sold for the first time will be described.

  FIG. 10 is a sequence diagram showing an example of processing at the time of the initial music data sales of the music distribution system S according to the present embodiment.

  First, when the user operates the operation unit 25 of the mobile phone Pk, the Web browser program stored in the storage unit 26 or the like is started, and the URL (Uniform Resource Locator) of the music distribution site is specified. Then, the system control unit 27 of the mobile phone Pk transmits a search page request to the content server CS as shown in FIG. 10 (step S1).

  The system control unit 13 of the content server CS that has received the search page request generates page data (Web content data) for searching for music data (step S2), and transmits the search page data to the mobile phone Pk ( Step S3).

  The system control unit 27 of the mobile phone Pk that has received the page data displays a music search page on the screen based on the page data, and accepts input of search conditions (for example, the title of the music, the name of the artist, etc.) by the user. Is started (step S4). When the search condition is input by the user, the system control unit 27 transmits a search request to the content server CS (step S5).

  The system control unit 13 of the content server CS that has received the search request searches the music DB 101 for music data that matches the search conditions (step S6), generates page data indicating the search result, and uses the page data as a mobile phone. Transmit to Pk (step S7).

  The system control unit 27 of the mobile phone Pk that has received the page data displays a search result page on the screen based on the page data and starts accepting selection input of music data by the user (step S8). When music data to be purchased is selected from the music data list displayed on the search result page, such as one music, a plurality of music, or the entire album, the system control unit 27 sends a music purchase request to the content. It transmits to server CS (step S9).

  The system control unit 13 of the content server CS that has received the music purchase request executes a charging process for the user of the mobile phone Pk (step S10). Specifically, for example, page data for inputting a user ID and password is transmitted to the mobile phone Pk, and based on the user ID and password input in the mobile phone Pk and information stored in the user DB. The user ID may be specified to perform authentication processing, and charging may be performed using credit card information (eg, card number, expiration date, etc.) stored in the user DB corresponding to the user ID. The page data for inputting the card information may be transmitted to the mobile phone Pk and charged using the credit card information input in the mobile phone Pk.

  Next, the system control unit 13 of the content server CS reads the selected music data from the music DB 101 and distributes the music data to the mobile phone Pk (step S11). Here, when a plurality of pieces of music data are distributed, the download flag information of each piece of music data is set to have a batch download.

  The system control unit 27 of the mobile phone Pk that has received the music data stores the music data in the storage unit 26 (step S12), and transmits a request for a reproduction application corresponding to the music data to the noise server NS (step S13). ). Specifically, for example, the application ID of the reproduction application corresponding to the music data is read from the music detailed information of the music data, and a request including the application ID is transmitted to the noise server NS.

  The noise server NS that has received the reproduction application request reads the reproduction application designated by the application ID or the like from the application DB 111 and distributes the reproduction application to the mobile phone Pk (step S14).

  The system control unit 27 of the mobile phone Pk that has received the playback application stores the playback application in the storage unit 26 (step S15), and ends the process.

  As described above, in addition to distributing the music data prior to the playback application, for example, the playback application may be distributed first, or both may be simultaneously distributed from the content server CS or the like. Also good.

  Next, an operation when music data is sold to a reseller will be described.

  FIG. 11 is a sequence diagram illustrating an example of processing at the time of selling the music data to the reseller in the music distribution system S according to the present embodiment.

  First, when the user operates the operation unit 25 of the mobile phone Pk, the system control unit 27 displays a list of song data that can be sold on the screen as shown in FIG. Is started (step S21). At this time, the music data for which the copy information is set to have already been copied has already been sold, so that the music data cannot be selected. Also, the music data for which the download flag information is set to batch download is displayed on the screen so that it can be selected only in a batch with the music data indicated in the corresponding music information. When the music data desired to be sold is selected by the user, the system control unit 27 transmits an upload request to the used content server US (step S22).

  The system control unit 13 of the used content server US that has received the upload request transmits an upload permission response to the mobile phone Pk (step S23).

  The system control unit 27 of the mobile phone Pk that has received the upload permission response activates the reproduction application corresponding to the selected music data, sets the copy information as already copied (step S24), and then corresponds to the music data. The reproduction application is read from the storage unit 26 and uploaded to the used content server US (step S25).

  The system control unit 13 of the used content server US that has received the music data and the reproduction application assigns 1 ID to them and stores them in the used music DB 121 (step S26). And the system control part 13 performs the addition process of a service point with respect to the user of the mobile telephone Pk (step S27), and complete | finishes a process.

  As a method for uploading music data or the like, in addition to the above, for example, music data may be attached to an e-mail addressed to the used content server US and transmitted to a predetermined mail server. Even in this case, the reproduction information of the music data is set as copied by the reproduction application.

  Next, the operation at the time of resale of music data will be described.

  FIG. 12 is a sequence diagram illustrating an example of processing at the time of resale of music data in the music distribution system S according to the present embodiment.

  First, when the user operates the operation unit 25 of the mobile phone Pk, the Web browser program stored in the storage unit 26 or the like is activated, and the URL or the like of the music resale site is designated. Then, the system control unit 27 of the mobile phone Pk transmits a search page request to the used content server US as shown in FIG. 12 (step S41).

  The system control unit 13 of the used content server US that has received the search page request generates page data for searching for music data (step S42), and transmits the search page data to the mobile phone Pk (step S43).

  The system control unit 27 of the mobile phone Pk that has received the page data displays a music search page on the screen based on the page data, and starts accepting input of search conditions by the user (step S44). When the search condition is input by the user, the system control unit 27 transmits a search request to the used content server US (step S45).

  The system control unit 13 of the used content server US that has received the search request searches the used music DB 121 for the music data that matches the search conditions (step S46), generates page data indicating the search result, and generates the page data. The data is transmitted to the mobile phone Pk (step S47).

  The system control unit 27 of the mobile phone Pk that has received the page data displays a search result page on the screen based on the page data, and starts accepting selection input of music data by the user (step S48). Then, when music data to be purchased is selected from the music data list displayed on the search result page, the system control unit 27 transmits a music purchase request to the used content server US (step S49).

  The system control unit 13 of the used content server US that has received the used music purchase request executes a billing process for the user of the mobile phone Pk (step S50), and uses the selected music data and the corresponding playback application as the used music. These are read from the DB 121 and distributed to the mobile phone Pk (step S51).

  The system control unit 27 of the mobile phone Pk that has received the music data and the playback application stores them in the storage unit 26 (step S52), and ends the process.

  Next, the operation when the release key is sold will be described.

  FIG. 13 is a sequence diagram illustrating an example of processing at the time of selling the release key of the music distribution system S according to the present embodiment.

  First, when the user operates the operation unit 25 of the mobile phone Pk, the system control unit 27 displays a list of music data stored in the storage unit 26 on the screen as shown in FIG. Reception of selection input of music data is started (step S61). At this time, only the music data in which the copy information is set to have been copied and the corresponding release key is not stored in the storage unit 26 is displayed as a list. Also, the music data for which the download flag information is set to batch download is displayed on the screen so that it can be selected only in a batch with the music data indicated in the corresponding music information.

  When the music data for which the user desires to purchase the release key is selected, the system control unit 27 transmits a release key purchase request to the used content server US (step S62).

  The system control unit 13 of the used content server US that has received the release key purchase request transmits the release key request to the noise server NS (step S63).

  On the other hand, the noise server NS that has received the release key request generates a corresponding release key (step S64), and transmits the release key to the used content server US (step S65).

  Then, the used content server US that has received the release key executes a billing process for the user of the mobile phone Pk (step S66), and transmits the received release key to the mobile phone Pk (step S67).

  The system control unit 27 of the mobile phone Pk that has received the release key stores the release key in the storage unit 26 (step S68), and ends the process.

  Note that the release key may be distributed directly from the noise server NS to the mobile phone Pk.

  Next, the operation of the cellular phone Pk when reproducing music data will be described.

  FIG. 14 is a sequence diagram showing an example of music data playback processing of the system control unit 27 of the mobile phone Pk according to the present embodiment.

  First, when the user selects music data to be reproduced by operating the operation unit 25 of the mobile phone Pk, the system control unit 27 activates a reproduction application corresponding to the selected music data.

  Then, as shown in FIG. 14, the system control unit 27 determines whether or not the copy information of the selected music data has been copied (step S101). When the music data is not uploaded to the used content server US after being downloaded from the content server CS (step S101: NO), only the regular music data of the selected music data is controlled by controlling the audio output unit 23. The music is reproduced and the music without noise is made loud from the speaker (step S102).

  On the other hand, when the copy information has been copied (step S101: YES), the system control unit 27 activates the deterioration reproduction program, and whether or not the release key corresponding to the selected music data is stored in the storage unit 26. Is determined (step S103).

  If the corresponding release key is not stored, that is, the selected music data is uploaded to the used content server US or downloaded from the used content server US, and the corresponding release key is released. If the key has not been purchased (step S103: NO), the system control unit 27 controls the audio output unit 23 to reproduce the regular music data and noise data of the selected music data (or noise is included). The music data is reproduced), and the music mixed with noise is made loud from the speaker (step S104).

  On the other hand, if the corresponding release key is stored (step S103: YES), the system control unit 27 controls the audio output unit 23 to select the regular music data, noise data, and reverse phase noise of the selected music data. The data is reproduced (or the music data from which noise has been removed is reproduced), and the music from which the noise has been removed is amplified from the speaker (step S105).

  As described above, according to the present embodiment, a playback application for playing back the music data is added to the music data stored in the used content DB 121 of the used content server US. Then, the system control unit 13 of the used content server US distributes the music data stored in the used content DB 121 to the mobile phone Pk, and the music data is stored in the storage unit 26 of the mobile phone Pk. . Next, the system control unit 27 of the mobile phone Pk activates the degraded reproduction program portion of the reproduction application added to the music data stored in the storage unit 26, thereby degrading the sound quality of at least a part of the music data. To play. In addition, when the release key for reducing the deterioration of the sound quality of the music data is acquired by the mobile phone Pk, the system control unit 27 activates the deterioration reproduction program part and, based on the acquired release key, The music data is reproduced with reduced deterioration in sound quality.

  Therefore, music data with degraded sound quality can be bought and sold in the same manner as used goods, and by introducing the concept of used music to music data, it is possible to effectively resell music data. Further, a reseller (or distributor) can sell a release key to a user who likes the resold music data and desires the music data with better sound quality.

  In addition, the music data after the release key is acquired has reduced deterioration in sound quality than at the time of resale, but since the sound quality is slightly deteriorated than at the time of initial sales, the music data that was sold for the first time, The sound quality can be differentiated from music data for which a corresponding release key is purchased after resale.

  Moreover, the music data includes regular music data, noise data, and reverse phase noise data (or includes regular music data, noise-containing music data, and noise-removed music data), and music data. If the song is not copied after the initial sale, only the regular song data is played. If it is copied after the first sale, the regular song data and the Izu data (or only the noisy song data) If there is a corresponding release key, regular music data, noise data, and reverse-phase noise data (or only noise-removed music data) are played, so that the processing capability of each part of the mobile phone Pk, for example Etc., it is possible to easily degrade the sound quality of the music data and to reduce the deterioration. It can be superimposed noise suitable for.

  The music data is added with copy information indicating whether the music data is copied after the first sale, and the system control unit 27 of the mobile phone Pk stores the music data stored in the storage unit 26. Is not copied after the first sale, the song data that has not been copied after the first sale is played back without deterioration by playing the song data without starting the degraded playback program part. Therefore, an incentive to lower the sales price at the time of resale than the price at the time of the initial sale is easy to work, and the resale of the content data can be performed more effectively.

  Furthermore, when selling the purchased music data to the secondhand dealer, the system control unit 27 of the mobile phone Pk, before uploading the music data stored in the storage unit 26 to the used content server US, The copy information is set to copied, and not only the music data resold, but also the sound quality of the music data targeted for sale deteriorates, so the music data sold for the first time, the music data targeted for sale, Sound quality can be differentiated between the two.

  Furthermore, music data that is downloaded alone and music data that is downloaded together with other music data are stored in the music DB 101 of the content server CS with respect to the music of the same content. As the number of songs downloaded in a batch increases, the degree of deterioration of sound quality decreases. Then, the system control unit 13 of the content server CS distributes the music data to be downloaded independently to the mobile phone Pk, while delivering a plurality of music data to be downloaded at once to the mobile phone Pk. For example, it is possible to improve the user's willingness to purchase a plurality of pieces of music data such as albums.

  Furthermore, the music data is added with download information indicating whether the music data has been downloaded in a batch, and the system control unit 27 of the mobile phone Pk has downloaded the music data in a batch. It is determined based on the download information, and if it is downloaded at once, the music data indicated in the download information and the used content server US are uploaded to the used content server US at the same time. A plurality of sold music data can then be distributed in the unit sold in a lump.

  In the above-described embodiment, even when the release key is acquired, when the music data that has been copied is played back, the sound quality is deteriorated compared to the music data before copying. When the key is acquired, it may be played back with the same sound quality as the music data before copying without activating the deteriorated playback program portion.

  In the above embodiment, in addition to regular music data, data for superimposing noise (for example, noise data, music data with noise, etc.) and data for removing noise (for example, reverse phase noise data, noise removed) The music data is composed including the music data, etc., but it is not always necessary to include these data in the music data, and the noise may be superimposed or removed only by the control of the playback application. good. Further, for example, while constituting music data without including the negative phase noise data, the negative phase noise data or the like is stored as cancellation data in a database or the like constructed in the storage unit 12 of the noise server NS, and the cancellation is performed. Reverse phase noise data or the like as data may be downloaded from the noise server NS or the like to the mobile phone Pk.

  Also, it is not always necessary to prepare a playback application that has a one-to-one correspondence with music data. For example, music data is created so that a plurality of music data can be played back by a single playback application, and a single album is created. May be prepared corresponding to a plurality of pieces of music data included, or one application corresponding to all music data may be prepared. In addition, the deterioration reproduction program may be separated from the reproduction application so that a plurality of pieces of music data can be reproduced by one reproduction application, and the deterioration reproduction program may be prepared corresponding to music data and one-to-one or one album. . In this case, for example, the deterioration control program is stored in the application DB 111, and the playback program is downloaded from the noise server NS or the like regardless of the music data download in the mobile phone Pk, or is previously stored in the mobile phone Pk. The corresponding deterioration control program may be downloaded from the noise server NS when the music data is downloaded. In addition, it is desirable that the reproduction application in this case is configured such that the corresponding music data cannot be reproduced unless the deterioration control program is downloaded.

  Further, the method of reducing the noise when reproducing the music data may not be a method for the purpose of almost complete noise removal such as superimposing reverse phase noise, for example, reducing noise to some extent. A method may be used.

  Further, as a method of deteriorating the sound quality of the music data, any method other than the method of superimposing noise can be used. For example, a method of silence at a predetermined time interval may be used. The release key in this case may be, for example, regular music data corresponding to the silent part, and the playback application and the regular music data may be played by a playback application so that the music without sound quality deterioration is amplified. .

  In the above embodiment, the music data is stored in the storage unit 26 of the mobile phone Pk even after the music data is uploaded from the mobile phone Pk to the used content server US. At this time, the music data may be deleted.

  In the above embodiment, the case where the music data is applied to the content data of the present invention has been described. For example, other audio data, movie data such as a movie, image data such as an electronic comic, text such as an electronic book, etc. It can be applied to any content data such as data. A method for degrading the quality of these content data can be arbitrarily selected. For example, in the case of moving image data, the sound quality may be deteriorated as in the above embodiment, noise may be superimposed on the moving image, or blanks may be displayed at predetermined time intervals. In the case of an electronic comic, for example, the image quality may be deteriorated, or a specific square may be displayed blank. In the case of an electronic book, for example, a part such as a specific character or sentence may be displayed in blank. The release key in these cases is, for example, data such as moving images, squares, characters, etc. corresponding to the blank portion, and after obtaining the release key, the release key and regular content data are combined and displayed, etc. You may make it show content data without.

  In the above-described embodiment, the case where the mobile phone is applied to the content presentation apparatus of the present invention has been described. For example, the present invention is applied to a personal computer, a PDA (Personal Digital Assistant), an STB (Set Top Box), a video game machine, and the like. It can be applied.

  In addition, the method of acquiring content data, a playback application, and a release key by the content presentation device is not limited to the method of downloading from the server device. For example, a drive device or the like is recorded from a recording medium such as a CD or a memory card. Or may be directly acquired from another content presentation device via a communication means such as a communication cable or a network. In this case, there may be no resale route via the used content server US or the like, but if the content presentation device is configured so that the content data cannot be accessed from a program other than the playback application, the content data can be copied by the playback application. (Including transmission) can be controlled, so that the content data copied after the initial sale always has deteriorated quality. Therefore, a content distributor or the like can make a profit by selling a release key. In addition, for the release key, for example, the content presentation device is configured so that it can be accessed only from the playback application, or the playback application is programmed so that it is effective only by the content presentation device of the user who purchased the release key. By doing so, misuse of the release key can be prevented.

  Further, instead of separately configuring the content server CS, the noise server NS, and the used content server US, for example, a part or all of them may be configured as an integrated server device.

  In the above embodiment, the present invention is applied to resale of content data (music data). However, the present invention is not limited to this. For example, the present invention may be applied to initial sales of content data. In this case, for example, content data is distributed free of charge as a trial version or at a low price. In the content presentation device, unless the corresponding release key is purchased, the quality is degraded and presented to the user. When a regular purchase is made, a release key may be distributed, and the content presentation device may stop the quality degradation and present it to the user. In this case, the user can audition all the content data whose quality has been deteriorated or view it for a trial before regular purchase of the content data. After confirmation, it can be determined whether or not to make a regular purchase. In addition, since the quality of content data that can be auditioned has deteriorated, even if the user views all of the content data, the content data is normally purchased (viewing at the original quality of the content data, etc.) Can be increased). In this case, content data may not be copied in the content presentation device.

It is a figure which shows an example of a schematic structure of the music delivery system S which concerns on this embodiment. It is a figure which shows an example of a structure of the music data which concern on this embodiment. It is a figure which shows an example of a structure of music audio | voice data, (a) is regular music data, (b) is noise data, (c) is reverse phase noise data. It is a block diagram which shows the example of an outline | summary of the fundamental structure common to the content server CS, noise server NS, and used content server US which concern on this embodiment. It is a figure which shows an example of the music data memorize | stored in music DB101. It is a figure which shows an example of the reproduction | regeneration application memorize | stored in application DB111. It is a figure which shows an example of used music data and reproduction | regeneration application memorize | stored in used music DB121. It is a block diagram which shows an example of schematic structure of the mobile telephone Pk which concerns on this embodiment. It is a figure which shows the example of allocation of the memory area in the memory | storage part 26 of the mobile telephone Pk. It is a sequence diagram which shows an example of the process at the time of music data initial sale of the music distribution system S which concerns on this embodiment. It is a sequence diagram which shows an example of the process at the time of sale to the reseller of the music data of the music distribution system S which concerns on this embodiment. It is a sequence diagram which shows an example of the process at the time of resale of the music data of the music distribution system S which concerns on this embodiment. It is a sequence diagram which shows an example of the process at the time of the cancellation | release key sale of the music distribution system S which concerns on this embodiment. It is a sequence diagram which shows an example of the music data reproduction | regeneration processing of the system control part 27 of the mobile telephone Pk which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Communication part 12 Storage part 13 System control part 14 System bus 21 Wireless communication part 22 Voice input part 23 Voice output part 24 Display part 25 Operation part 26 Storage part 27 System control part 28 System bus 101 Music DB
111 Application DB
121 Used music DB
Pk mobile phone CS content server NS noise server US used content server NW network S music distribution system

Claims (8)

A content delivery server device that delivers content data to a content presentation device that presents content data to a user,
A quality degradation program for degrading the quality of at least a part of the content data is added to the content data,
Content storage means for storing the content data;
Content distribution means for distributing the stored content data to the content presentation device via communication means,
The distributed content data is stored in storage means of the content presentation device,
The quality deterioration program added to the content data stored in the storage means is activated by the content presentation device and serves as deterioration presentation means for presenting the content data to the user with at least a part of the quality deteriorated. Functioning the content presentation device,
When quality degradation stop reduction data for stopping or reducing the quality degradation of the content data is acquired by the content presentation device, the quality degradation program is stopped from starting or the quality degradation stop A content distribution server device that causes the content presentation device to function as the deterioration presenting means for presenting the content data to the user while reducing the deterioration of the quality based on the reduced data. In the content delivery server apparatus according to claim 1,
Of the content data stored in the content storage means, the content data sold together with the other content data is content data having a lower degree of deterioration in quality than content data sold alone. ,
The content distribution server device, wherein the content distribution unit distributes a plurality of the content data sold in a batch to the content presentation device. In the content delivery server apparatus according to claim 1 or 2,
The content data includes sound data,
A noise component is added to the sound data,
The content distribution server device, wherein the quality deterioration program causes the content data to function as the deterioration presentation means for reproducing the sound data together with the added noise component. The content presentation device according to claim 3,
The sound data further includes a phase inversion component of the noise component,
When the quality degradation stop reduction data is acquired by the content presentation device, the quality degradation program converts the sound data based on the quality degradation stop reduction data to the noise by the added phase inversion component. A content distribution server device, wherein the content data is made to function as the deterioration presenting means for removing and reproducing a component. A server device that distributes the quality degradation stop reduction data according to claim 1,
A server apparatus comprising: a quality degradation stop reduction data distribution unit that distributes the quality degradation stop reduction data to the content presentation device via the communication unit. The content presentation device according to claim 1,
Obtaining means for obtaining the distributed content data;
Content storage means for storing the acquired content data in the storage means;
Deterioration stop reduction data acquisition means for acquiring the deterioration stop reduction data from the server device via the communication means;
The deterioration presenting means;
A content presentation device comprising: A content distribution method for distributing content data to a content presentation device that presents content data to a user,
A quality degradation program for degrading the quality of at least part of the content data is added to the content data,
A content storage step for storing the content data;
A content distribution step of distributing the stored content data to the content presentation device via a communication unit;
The distributed content data is stored in storage means of the content presentation device,
The quality deterioration program added to the content data stored in the storage means is activated by the content presentation device, and is a deterioration presentation means for presenting the content data to the user with at least a part of the quality deteriorated. Functioning the content presentation device,
When quality degradation stop reduction data for stopping or reducing the quality degradation of the content data is acquired by the content presentation device, the quality degradation program is stopped from starting or the quality degradation stop A content distribution method characterized by causing the content presentation device to function as the degradation presentation means for presenting the content data to the user by reducing the degradation of the quality based on reduced data. A content delivery server device that delivers content data to a content presentation device that presents content data to a user, wherein content data to which a quality degradation program for degrading the quality of at least a part of the content data is added A computer included in the content distribution server device to be distributed,
Content storage means for storing the content data;
Causing the stored content data to function as a content distribution unit that distributes the content data to the content presentation device via a communication unit;
The distributed content data is stored in storage means of the content presentation device,
The quality deterioration program added to the content data stored in the storage means is activated by the content presentation device, and is a deterioration presentation means for presenting the content data to the user with at least a part of the quality deteriorated. Functioning the content presentation device,
When quality degradation stop reduction data for stopping or reducing quality degradation of the content data is acquired by the content presentation device, the quality degradation program is stopped from starting or the quality degradation stop A content distribution processing program that causes the content presentation device to function as the deterioration presenting means for presenting the content data to the user while reducing the deterioration of the quality based on the reduced data.

Images